EP 0821317 A3 20001108 - Method and system for decoding distorted image and symbology data
Title (en)
Method and system for decoding distorted image and symbology data
Title (de)
Verfahren und System zum Dekodieren von Bild- und Symboldaten
Title (fr)
Procédé et système de décodage de données d'images et de symboles
Publication
Application
Priority
US 68712496 A 19960724
Abstract (en)
[origin: EP0821317A2] Disclosed is a system and method for reading and decoding distorted data, e.g., bar code label or other symbology data, by fitting a scanned signal model j(t, θ), using a Deterministic Expectation-Maximization (DEM) algorithm, to the measured or detected data signal y(t). The DEM algorithm, which is a novel variation of the conventional Expectation-Maximization (EM) algorithm, enables the system and method according to the invention to determine the values of a plurality of parameters θ defining the scanned signal model j(t, θ) as it is being fitted to the measured data signal y(t). Based on these values, characteristic information such as data elements or symbols encoded within the image data are generated using conventional signal processing techniques. The use of the DEM algorithm advantageously deblurs the signal by reducing the effects of intersymbol interference. In an alternative embodiment, the DEM algorithm is supplemented by a conventional zero crossings decoding technique. In this manner, the zero crossings technique is used to obtain initial parameter estimates for the DEM algorithm in determining the parameters θ of the scanned signal model j(t, θ). <IMAGE>
IPC 1-7
IPC 8 full level
G06K 7/00 (2006.01); G06K 7/10 (2006.01); G06K 7/14 (2006.01)
CPC (source: EP US)
G06K 7/14 (2013.01 - EP US)
Citation (search report)
- [X] EP 0634730 A2 19950118 - SICK OPTIK ELEKTRONIK ERWIN [DE]
- [X] ZHENGRONG LIANG ET AL: "PARAMETER ESTIMATION AND TISSUE SEGMENTATION FROM MULTISPECTRAL MR IMAGES", IEEE TRANSACTIONS ON MEDICAL IMAGING,US,IEEE INC. NEW YORK, VOL. 13, NR. 3, PAGE(S) 441-449, ISSN: 0278-0062, XP000474134
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0821317 A2 19980128; EP 0821317 A3 20001108; JP H1091714 A 19980410; US 5780830 A 19980714
DOCDB simple family (application)
EP 97305266 A 19970715; JP 19893397 A 19970724; US 68712496 A 19960724